The Fang of Critias

Normal / Spell(This card is also always treated as "Legendary Dragon Critias".)Send 1 Trap from your hand or field to the GY, that is listed on a Fusion Monster that can only be Special Summoned with "The Fang of Critias" (if that card is Set, reveal it), then Special Summon that Fusion Monster from your Extra Deck. You can only activate 1 "The Fang of Critias" per turn.

The three Legendary Dragons are named after Plato's Dialogues, from which we have many of our myths pertaining to the lost city of Atlantis. The German name of this card, Kralle des Critias, means Claw of Critias. An accurate translation of The Fang of Critias would be Der Reißzahn von Critias.The Fang of Critias is the only Legendary Dragon who does not have a Fusion Monster that appears in more than one episode. This is the only Legendary Dragon card that did not receive a major artwork change from its anime counterpart, instead receiving a more detailed rendering of its anime artwork.